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@Chak
Depending on frame, most road oriented bikes won’t be able to clear a 180mm rotor.
A well setup, frequently bled system with good, well bedded braking components will more than be able to stop you with ease.
180 won’t make braking ‘better’ per se. Your limitation will always be the grip limit on tyres.
More so with a polo bike, you won’t be going fast enough where you need that much surface area to dissipate heat or stop you so quick. A 160 will do just the same.
Exception being freeride or enduro stuff where you’re battering the brakes under heavily contaminated conditions.
I’d personally look at brake lever ergonomics (longer lever, maybe stroke adjustability) and position of lever relative to your requirement.